Nighttime concerns

I am currently 9 months into my first job as an RN as a nurse on L&D. My orientation was for 5 months on days. As a new L&D nurse (and a new nurse period), I found more comfort on days shift knowing that the docs were close by and USUALLY one or more was in house. Anesthesia was always in, too. Now on nigts, our docs (OB and anesthesia) are 25-30 minutes out. I am getting gray hair and high blood pressure with the stress of delivering my patients, dealing with pp bleeding and pts that come through the door who need a DOCTOR. Am I over-reacting because I am new or is this a valid concern? By the way, the other night nurses aren't much help. Maybe just something for new L&D RNs to consider before taking a job on nights...